/* main.css */
.header {
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    height: 60px;
}

.header ul {
    height: 60px;
}

.header img {
    position: relative;
    top: 14px;
}

.menu {
    position: absolute;
    left: 0;
    top: 60px;
    bottom: 0;
    width: 178px;
}

.main {
    position: absolute;
    top: 60px;
    left: 178px;
    right: 0;
    bottom: 0;
}

.main iframe {
    border: none;
    width: 100%;
    height: 100%;
    background-color: azure;
}